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YoungReckless4
3cd3836d77
* fix(amneziawg): account for S4 junk in the default tunnel MTU
amneziawg prepends S4 random bytes to every transport packet
(device.NewOutboundElement) and, unlike content padding and random trailers,
never clamps them against the tunnel MTU. A full-size packet therefore lands on
the wire at MTU + 60 + S4 bytes: 20 IPv4 + 8 UDP + S4 + 16 transport header +
16 poly1305 tag.
With the 1420 default that overflows a 1500-byte link once S4 exceeds 20, and
GenerateObfuscation31 draws S4 from 12..27 inclusive -- so roughly 44% of newly
created inbounds fragment every full-size packet they send.
Measured on a live pair of interfaces, predicted against observed:
MTU 1380 S4 12 -> 1452 on the wire (fits)
MTU 1420 S4 12 -> 1492 (fits)
MTU 1420 S4 20 -> 1500 (exactly at the limit)
MTU 1420 S4 21 -> 1501 (fragments)
MTU 1420 S4 27 -> 1507 (fragments)
EffectiveMTU now subtracts S4 from the default; an explicit MTU is untouched.
Client configs carry the same number. They previously omitted the MTU line
whenever the server had no explicit value, which left the client on its own
1420 default and fragmented the client-to-server direction even after the
server side was fixed -- silently, and only in one direction. All three
emitters (the Go subscription text and the two TypeScript ones) now agree,
which is what the existing parity test exists to protect.
* fix(amneziawg): rebuild the device when S4 changes the derived MTU
Addresses review feedback on the previous commit.
Deriving the default MTU from S4 made a construction-time-only property depend
on a hot-reloadable input, but addressFingerprint -- ensureLocked's only rebuild
trigger -- still hashed the raw inst.MTU. S4 is a UAPI field, so an S4-only edit
took the in-place IpcSet branch and the gVisor netstack kept the MTU derived
from the old S4 while all three client emitters already advertised the new one.
Every panel-created inbound leaves mtu unset, so that was the normal case, not
an edge one: with S4 raised far enough the fragmentation this fix exists to
remove came straight back, and stayed until a panel restart or an unrelated
address edit.
Folding EffectiveMTU into the fingerprint fixes it. An explicit MTU still takes
the in-place branch on an S4 edit, since it does not move the interface MTU.
Also trims four comment blocks to the 2-line cap in CLAUDE.md, and points
NewDevice's doc comment at EffectiveMTU instead of the deleted defaultMTU.